Just like, “Oh, so many people, they have got a spiritual master. Let me have also some spiritual master.” It is not like that. It is only jijñāsuḥ, one must be very much inquisitive of the transcendental subject matter. He requires a spiritual master. So here also, the Lord says that tad viddhi: “If you want to understand that transcendental subject matter, then you must approach a person, a bona fide spiritual master.”
And the process is praṇipāta, praṇipātena. Praṇipāta means full surrender. Pra means prakṛṣṭa-rūpeṇa, fully, and nipāta means completely becoming a blank slate. Blank slate. Nobody should approach a bona fide spiritual master just to argue with him and just to, with a desire that “I shall see what kind of spiritual master.” No. This is useless. You have to select a spiritual master…
My Guru Mahārāja, my spiritual master, used to say that you have to select a spiritual master not by seeing but by your ear, but by hearing. And you don’t select a spiritual master who has got a very good hair or beard or some very beautiful feature, “Oh, he is a very good, nice looking.” No. You must hear. Tad viddhi praṇipātena (BG 4.34). Śruti. The whole process is śruti. The Vedas are called śruti. The ear has to aural reception.
By His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Lecture on BG 4.24-34, New York, August 12, 1966